To cause someone to believe an untruth; to practice trickery or fraud.
To be sexually unfaithful to one's spouse or lover.
reveal unintentionally; "Her smile betrayed her true feelings"
deliver to an enemy by treachery; "Judas sold Jesus"; "The spy betrayed his country"
be sexually unfaithful to one's partner in marriage; "She cheats on her husband"; "Might her husband be wandering?"
cause someone to believe an untruth; "The insurance company deceived me when they told me they were covering my house"
give away information about somebody; "He told on his classmate who had cheated on the exam"
disappoint, prove undependable to; abandon, forsake; "His sense of smell failed him this time"; "His strength finally failed him"; "His children failed him in the crisis"
be sexually unfaithful to one''s partner in marriage; "She cheats on her husband"; "Might her husband be wandering?"
